Question 1 : $I$. Metallic solids tend to be very brittle.$II$. Metallic bonds are broken quite easily.

Question 4 : What is the smallest part of the crystal that has the three-dimensional pattern of the whole lattice called?

Question 8 : Solid $X$ is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it?

Question 10 : <b>Statement-I: &#160;</b>Initially the term pseudo solid was given for solids&#160;which were easily distorted by bending and&#160;compressing forces. They even tend to flow slowly&#160;under its own weight and lose shape.<br/><b>Statement-II:</b> &#160;These characteristics are shown by pseudo solids as in pitch, glass and thus, the name pseudo solid was replaced by supercooled liquids.<br/>

Question 14 : Unlike phenol, 2,4-dinitrophenol is soluble in sodium carbonate solution in water because ?

Question 16 : A primary amine can be converted to an alchohol by the action of

Question 17 : Which of the following statements is not correctly showing the trend of the properties mentioned ?

Question 18 : Alcohols containing only up to ___________ carbon atoms are completely miscible with water.<br/>

Question 19 : When $ H_2C = CH-COOH $ is reduced with $ LiAlH_4 $, the compound obtained will be:

Question 26 : Nitrogen form $N_2$, but phosphorous form $P_2$, it'sat a time convert in $P_4$, reason is : -

Question 28 : Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?

Question 32 : Which among the group-$15$ elements does not exists as tetra atomic molecule?

Question 41 : The chlorination of ethane is an example for which type of the following reactions?

Question 42 : Which step is chain propagation step in the following mechanism?<br/>$Cl_2\xrightarrow [&#160; ]{ hv } Cl^{\bullet} + Cl^{\bullet}$<br/>$Cl^{\bullet} + CH_4\rightarrow \,^{\bullet}CH_3 + HCl$<br/>$Cl^{\bullet} + Cl^{\bullet} \rightarrow Cl_2$<br/>$^{\bullet}CH_3 + ^{\bullet} Cl \rightarrow CH_3Cl$<br/>

Question 43 : <br/>$CH_3-\overset{CH_3}{\overset{|}{C}}H-CH_2-CH_3+Br_2\xrightarrow[]{hv}$ P (Major product)&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; (on monobromination)&#160;The product P is :

Question 44 : Assertion: Addition of one equivalent of $HCl$ to 1,3-butadiene at ${80}^{o}C$ gives 3-chloro-1-butene as major product. Reason: 3-chloro-1-butene is a kinetically controlled product.<br/>Read the above assertion and reason and choose the correct option regarding it.

Question 45 : A solution of $(R)-2-$iodobutane, $[\alpha]= 15.9^{\circ}$ in acetone is treated with radioactive iodied, until $1.0$% of iodobutane contain radioactive iodine, the specific rotation of recovered iodobutane is found to be $-15.58^{\circ},$ which statement is correct about above information?

Question 46 : One kilogram of sea water sample contains $6\ mg$ of dissolved $O_{2}$. The concentration of $O_{2}$ in the sample in ppm is:

Question 47 : If we take 44g of${ CO }_{ 2 }$and 14g of${ N }_{ 2 }$ , what will be themole fraction of${ CO }_{ 2 }$in the mixture?

Question 48 : Which of the following are homogenous in nature ?<br>(i) Ice<br>(ii) Wood<br>(iii) Soil<br>(iv) Air

Question 49 : Two liquids A and B have vapour pressures in the ratio $P^0_A : P^0_B=2 : 3 $ at a certain temperature. Assuming that A and B form an ideal solution and ratio of mole fractions of A and B in the vapour phase is 1 : 3 , then the mole fraction of A in the solution at the same temperature is :

Question 52 : One litre hard water contains $1$ mg $\displaystyle CaCl_{2}$ and $1$ mg $\displaystyle MgSO_{4}$. The hardness of water is:

Question 53 : The mole fraction of water in 20% (wt. / wt.) aqueous solution of $H_2O_2$ is:

Question 54 : $500$&#160;g of urea solution of mole fraction&#160;$0.2$&#160;is diluted to&#160;$1500$&#160;g. The mole fraction of&#160;solute&#160;in&#160;the diluted solution is:

Question 55 : Assuming that concentration of ${Ca}^{2+}$ ions in solution is in equal equivalence ratio to chloride ions, the hardness of water is&#160;: